Update ReleasesFinder to reduce queries

What does this MR do and why?

This MR addresses the discussion in #412364 (closed) to apply an optimization to the ReleasesFinder so it executes fewer queries.

Here we replace Project.id_in(parent.map(&:id)).include_project_feature with ActiveRecord::Associations::Preloader.new(records: parent, associations: :project_feature).call so that we reuse the existing list of projects instead of pulling them anew from the database.

MR acceptance checklist

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Related to #412364 (closed)